Claude Code v2.1.281 Update - MCP Server Validation and Session Stability Improvements

Anthropic released Claude Code v2.1.281. MCP server configuration validation now pre-checks ignored items and undeclared variable references at load time. Fixed

Claude Code · Release v2.1.281 · 2026-09-23

Anthropic released Claude Code v2.1.281. MCP server configuration validation now pre-checks ignored items and undeclared variable references at load time. Fixed crashes during API request retries and history inconsistencies on session resume. Improved error handling when proxies or gateways interrupt streams, and enhanced stability for large session restoration.

weltiq perspective: Improved MCP server integration stability and session restoration reliability enhance error recovery capabilities for automated trading bots during extended operations.

Release Notes Excerpt

What's changed Added Claude apps gateway support for newer Claude Desktop keys in desktop policy blocks, including blockReadsOutsideWorkingDirectories and disableBypassPermissionsMode Added assume_role on Claude apps gateway Bedrock upstreams: the gateway calls Bedrock as an IAM role it assumes through STS, in another AWS account if needed, optionally one session per developer Added guardrail: {id, version} on Claude apps gateway Bedrock upstreams to apply an Amazon Bedrock guardrail to every request sent through them (set it on all Bedrock upstreams or none) Added telemetry.resource_attributes to the Claude apps gateway config, to put fixed labels on the telemetry of Claude Desktop and /log…

Source: https://github.com/anthropics/claude-code/releases/tag/v2.1.281